[cip-dev] [PATCH 4.4.y-cip 05/10] rtc: pcf85363: Add support for NXP pcf85263 rtc

From: biju.das@bp.renesas.com (Biju Das)
To: cip-dev@lists.cip-project.org
Subject: [cip-dev] [PATCH 4.4.y-cip 05/10] rtc: pcf85363: Add support for NXP pcf85263 rtc
Date: Tue, 16 Jul 2019 09:15:16 +0100	[thread overview]
Message-ID: <1563264921-42973-6-git-send-email-biju.das@bp.renesas.com> (raw)
In-Reply-To: <1563264921-42973-1-git-send-email-biju.das@bp.renesas.com>

commit fc979933bcf162595b6004d0de4effb64c323152 upstream.

Add support for NXP pcf85263 real-time clock. pcf85263 rtc is compatible
with pcf85363,except that pcf85363 has additional 64 bytes of RAM.

1 byte of nvmem is supported and exposed in sysfs (# is the instance
number,starting with 0): /sys/bus/nvmem/devices/pcf85x63-#/nvmem

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
[ Removed rtc nvmem support. Added I2C ID table for rtc-pcf85263 ]
---
 drivers/rtc/rtc-pcf85363.c | 40 ++++++++++++++++++++++++++++++++--------
 1 file changed, 32 insertions(+), 8 deletions(-)

diff --git a/drivers/rtc/rtc-pcf85363.c b/drivers/rtc/rtc-pcf85363.c
index dc57a6f..64217f1 100644
--- a/drivers/rtc/rtc-pcf85363.c
+++ b/drivers/rtc/rtc-pcf85363.c
@@ -87,6 +87,11 @@ struct pcf85363 {
 	struct regmap		*regmap;
 };
 
+struct pcf85x63_config {
+	struct regmap_config regmap;
+	unsigned int num_nvram;
+};
+
 static int pcf85363_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
@@ -148,16 +153,33 @@ static const struct rtc_class_ops rtc_ops = {
 	.set_time	= pcf85363_rtc_set_time,
 };
 
-static const struct regmap_config regmap_config = {
-	.reg_bits = 8,
-	.val_bits = 8,
-	.max_register = 0x7f,
+static const struct pcf85x63_config pcf_85263_config = {
+	.regmap = {
+		.reg_bits = 8,
+		.val_bits = 8,
+		.max_register = 0x2f,
+	},
+	.num_nvram = 1
+};
+
+static const struct pcf85x63_config pcf_85363_config = {
+	.regmap = {
+		.reg_bits = 8,
+		.val_bits = 8,
+		.max_register = 0x7f,
+	},
+	.num_nvram = 2
 };
 
 static int pcf85363_probe(struct i2c_client *client,
 			  const struct i2c_device_id *id)
 {
 	struct pcf85363 *pcf85363;
+	const struct pcf85x63_config *config = &pcf_85363_config;
+	const void *data = of_device_get_match_data(&client->dev);
+
+	if (data)
+		config = data;
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 		return -ENODEV;
@@ -167,7 +189,7 @@ static int pcf85363_probe(struct i2c_client *client,
 	if (!pcf85363)
 		return -ENOMEM;
 
-	pcf85363->regmap = devm_regmap_init_i2c(client, &regmap_config);
+	pcf85363->regmap = devm_regmap_init_i2c(client, &config->regmap);
 	if (IS_ERR(pcf85363->regmap)) {
 		dev_err(&client->dev, "regmap allocation failed\n");
 		return PTR_ERR(pcf85363->regmap);
@@ -185,12 +207,14 @@ static int pcf85363_probe(struct i2c_client *client,
 
 static const struct i2c_device_id pcf85363_id[] = {
 	{ "pcf85363", 0 },
+	{ "pcf85263", 0 },
 	{ }
 };
 
 static const struct of_device_id dev_ids[] = {
-	{ .compatible = "nxp,pcf85363" },
-	{}
+	{ .compatible = "nxp,pcf85263", .data = &pcf_85263_config },
+	{ .compatible = "nxp,pcf85363", .data = &pcf_85363_config },
+	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, dev_ids);
 
@@ -206,5 +230,5 @@ static struct i2c_driver pcf85363_driver = {
 module_i2c_driver(pcf85363_driver);
 
 MODULE_AUTHOR("Eric Nelson");
-MODULE_DESCRIPTION("pcf85363 I2C RTC driver");
+MODULE_DESCRIPTION("pcf85263/pcf85363 I2C RTC driver");
 MODULE_LICENSE("GPL");
-- 
2.7.4
